Transmission gearing



July 3, 1928;`

S. TOMPKINS TRANSMISSION GEARING -Filed July 6, 1927 www@ I INVENTOR M am WITNESS A w g hy/5% N Patented July Y3, 1928.

lPATENT OFFICE.

STONEWAL. TOMPKINS, OF PASSAIC, NEW JERSEY.

TRANSMISSION GEARING.

application led July 6, 1927. Serial No. 203,775.

This invention relates Y to transmission gearing in which gear shift devices are combined with 'a planetary transmission with theV yobject of obtaining the advantages of Vboth methods.

Y A primary purpose of the invention is to so control the two kinds of transmission Ythat they may be operated by the same control means and in the same manner of control as is now the general practice in autoy mobiles; namely, with a gear shift level' for neutral, low, high and reverse andI a footpedal for holdin-g open a clutch against the closing effort of a spring.v

, Another obl ect of the invention is to introduce in the midmotion of the foot lever .a coupling of the planetary gears in a combination thatwill give low gear before the full speed is effected by the complete re.- lease of the foot lever. A further purpose of the invention is to combine with the above described functions a gear shift mechanism ofthe ordinary type, but with only two i forward Speed ratios and one reverse whereby the operator mayv have lavailable four forward speeds'and two reverses. Ak further object ofthe invention is to provide a pawl` device between the low speed clutch and the high speed clutch whereby the forstrain the latter.

mer will not in any event interfere or rre- Other objects will appear from the following description of anA embodiment ofmy invent-ion.

In the accompanying drawings l Figure 1 represents an-embodiment of my.

invention in longitudinal axial section.

Figure 2 is a transverse section on line,

2-2 of Figure 1, andA clamping device on line 3 3 of Figure 1.

At l is shown an engine shaft or driving member which maybe the engine shaft of'V v an automobile engine. Keyed to this shaft which engage the planetary pinions 5, which in turn are carried on studs 6 mounted in brake.

21 to a foot lever 22 having a pedal 23. This lever is pivoted to the frame of the engine at 24 and has an arm 25 which is Figure?) -is a section through the brake a planetary gear carrier 7 This gear carrier is keyed to a second shaft S in axial alinement with the engine shaft. Revolving freely upon the second shaft 8 is a floating gear 9 having at 10 internal gear teeth meshingwith the planetary pinions 5. A second floating member 11 is mounted to turn Vfreely7 on the hub of the Boating gear 10.

extension 16 which passes through holes in the ears 17 of the brake band 14, and on the end of the shaft furthest from the lever, cam arms 18 .extend radially, which cam arms ata certain intermediate position of the lever 15 are adapted to ride up over cam bosses 19 on one of the ears 17, the result of which is to draw the ears 17 together against the force of an intermediate spring 20 and clamp the brakes. Any movement of the lever in either direction will release the The lever 15 is connected by a rod forked at its lower end to straddle and engage a thrust ring 26 within which a revolving hub 27 turns. The hub 27 has pivoted at 28 clutch binding levers 29. A member 30 secured to the sec-ond shaft 8 serves as an abutment for the clutch binding members 29,

, the ends of said members having inclined extensions 31 that, 1n the position shown in Figurevl, impinge against a ring 32 between which and the floating member 11 is a friction disc Other friction discs 33', 33,

and, 33', are located respectively between the member l1 and 'casing 3, between the casing 3 and floating gear 9, and between floating gear 9 and the planetary gear carrier 7 All these parts are firmly clamped when the clutch binding niembers29 are set up. in the clutch closing Vposition as shown in Figure l. They are forced into this posi-` tion by a clutch spring 34'liaving an abutment 35. secured to the second shaft and pressing againstthe thrust collar 27 to which j the clutch members 29 are articulated.

Y llhen so operating, the cam members 118 and When the clutch members are so set into tlieir holding position all the parts shown `to the left of rthe spring are revolving j together as is usual in automobile transmissions.

19 are not in contact. A1336 is shown a third or driven shaftjournalledin a gear f case 37 and-having mounted loosely upon it two bevel VWheels '38 and v39 meshing re-V spectively with gears 40 and 41'c'a'rried `by a 'stu'dshaft 42 on' the casing'37. The stud shaft 42`i`s inclined at such anangle to the sliaft`36'as will give the proper ratio of speeds between vthe various gears. Another bevel'wheel 43 is secured to the-second shaftVK 8 and'liasinterior Aclutch teeth 44- adapted 'to engagev with a 'gear clutch 45 sliiftable aXially on-the shaft 36 and rotatedyvith the said'slia'ftfby spline 46. The gear clutch V'also has teeth 47iadapted to engage interior lteeth 59 in thefgear '39 =to leek 'the .shaft '8 teeth 48 iii the bevel'iwlieel 38. The gear clutch 45, "47 is 'movable `along Ithe shaft 8 by means of a forkedshijfting niember49 'cairiedby 'shiftingrod 50 aiidoperatablelby a'gear sliiftinglever'l.pivoted at 52fand en- :gaginjg'byv its 'lower end .53 in a slotted .projje'c'tion 54 secured to the'shifting rod'O. In

`like' manner another shifting rod '55 maybe "engaged by the same lever` en`d`531bya lateral Amot-ion ofthe .lever 51,'tli'e bearing 52 being made inthe nature of agimbal orb'all bearing for this purpose. The shifting rod carriesa shifting fork 56 which engages with a clutch geaii' movable onspline 58cm the vshaft 8 Vand'adapted to 'engage internal j tothe gear 39 to make'them "tnrn1t0gether.

The transmission gear is operated as' follows:

lith the parts inthe position shown in 'Figure 1, the engine 'shaft maybe running, "but with thegear sliiftlever 5l in the neutral position as shown, the third or driven shaft 36 will be-disconnecte-d from the mov- 'ing fparts. The .spring 'will hold '.tlie clutch members fast togetlienthe'second@shaft will Ybe turning with the first shaft,` and V'gears 43, 49, and 41 and38 ,-willall idle. V'To 'start up in 'the 'lowest speed,"the Yoperator will 'depress 'the foot pedal 'be running as far as possible pressing vthe vspring 434 .and holding'it Compressed ywhile the 'shift lever .'51 is 60' v` lrn'oved in engagement with .partf54 "by a Vlateral motion, and then by a'long'itudinal motion,'thr0rving gear 47r-into engagementwith j gear 48. Then lifting fhis foot slightlyfthe cams 18 and l9'willride'upon each `other and set: the Ybrake "-l 4,thus lholding stationary theoatingmernber 11 and throughthe pawls l2holding stationary also-the floating gear-9 which will tlienact as an abutment gear upon vwhich the planetary pinions 5 will roll and thereby propel the member 7 at a speed approximately one third that of theV driving shaft. The second shaft being driven iat this reducedspeed YVpasses themetionon'througliits end pinion 43 to gear 41 'wliichthns turns at a slower speed and this slower speed is `communicated by gears 40'v and 38 to the driven shaft giving a reduc- `tion offsa'yQ to l from the first to third shaft. Leaving the gear shaft lever 51 in `th-is position, the foot pedal may be released still farther unt-il the cams `18, V19A become-.disengaged thus'releasing 4thez'brake '14.A urther release of the clutchfpetlal will-'allow the spring 34'tof press allthe meinhersfoffthe clutch assemblage togetherthru 4'tlieactio'n l of the clutching .members29, whereupon'the Heating gear 9 will tendto turn with`the fly wheel instead of being pushed .in Vthe Y vopposite direction. Y"It :will .be ffree tto "turn in tliis'direction even ifthebrakel4`lias not entirely released "the "member l'lon account yof the .pawl members I12. `'This :willgive an intermediate speed with 'both the hand "lever and the' foot lever in position"Of'repose *"To Work on still higher lranges of 'spee d,.theffoot lever is` again depressed to itstfull amount,

thus releasing vthec'luteh, and the :shifting lever then'moves to engagetlie gear "45 with gear 44 when Athe footqpedaljmay beagain Vmanipulated as before'togive tivo speedsj'of higher rangethan the Vtwo lower'speeds just u described. lnwthis'case', the gear 43 ,is" driv ing the third "shaft direct. To obt'ainjaxreverse motion, gear shiftlever 51 `is made to engagewithI shifting rodi55 and then gear Y' 57 is forced finto Veng-agement withgear? 59,` whereupon the gear 39 `becomes yl'oketl-fto Ythe driven shaft and the power gis .transinitted through the 'gears41 and .3 9 tog give a reverse moti'oii'ftojthe' drivengshafftat a lower rate of speed. Y

The sliding gear transmission s'hownf'and described is not claimed herein as s:iorms the subject matter'of'a separate vapplif'iation gear. stationary to cause the pl'anetaryjgears to Jdrive the second shaft at slowerspeed than the driving shaft, clutch vineiiibers v-adjapt'ed to .clamp 'the drivingjshaftfto`th'e..1sec0nd shaft @for `high Speed, a spring 'adapted to -holdjthe .clutch lmembers V'so clamped, fa lin-ot lever adapted to flio'li'l thefspring "retracted and the clutch members .unclaiiped fand tnieans joperatable by Athe said lever :for fset- "ting "the brake "on the iHeating gear during a first part of the movement of the lever and releasing the said brake during a second 'part'of its movement.

2. A construction according to claim 1 in which means are 'interposed between the floating gear and its brake whereby the Ybrake is effective in one direction only.

3. A construction according to claim 1 in which a second floating member 1s inter- 10 posed between the floating gear and the brake with slip pawls between the floating members to permit relative motion between the said members in one direction only.

4. A construction according to claim l in which there is an abutment member on l5 

